高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (12): 20240298.doi: 10.7503/cjcu20240298

• 物理化学 • 上一篇    下一篇

双S型YVO4/TiO2/BiVO4 异质结的构筑及光催化CO2还原性能

曹铁平1, 李跃军1,2(), 孙大伟2   

  1. 1.海南科技职业大学化学与材料工程学院, 海口 570100
    2.白城师范学院化学学院, 白城 137000
  • 收稿日期:2024-06-21 出版日期:2024-12-10 发布日期:2024-09-19
  • 通讯作者: 李跃军 E-mail:bc640628@163.com
  • 基金资助:
    国家自然科学基金(21573003)

Construction of Double S-scheme YVO4/TiO2/BiVO4 Heterojunction and Its Photocatalytic CO2 Reduction Performance

CAO Tieping1, LI Yuejun1,2(), SUN Dawei2   

  1. 1.College of Chemistry and Materials Engineering,Hainan Vocational University of Science and Technology,Haikou 570100,China
    2.College of Chemistry,Baicheng Normal University,Baicheng 137000,China
  • Received:2024-06-21 Online:2024-12-10 Published:2024-09-19
  • Contact: LI Yuejun E-mail:bc640628@163.com
  • Supported by:
    the National Natural Science Foundation of China(21573003)

摘要:

以电纺TiO2纳米纤维为基质, 通过一步水热法制备了双S型YVO4/TiO2/BiVO4异质结复合纤维材料. 采用X射线衍射仪、 扫描电子显微镜、 透射电子显微镜、 X射线光电子能谱仪、 紫外-可见吸收光谱仪和光致发光技术等对其结构和成分进行表征, 并研究了模拟太阳光下复合催化剂的光催化CO2还原性能. 结果表明, YVO4/TiO2/BiVO4复合纤维材料对CO2的还原能力优于单体材料, 光催化CO2生成CH4和CH3OH的速率分别为13.88 和3.46 μmol∙g‒1∙h‒1. 光催化活性的提高归因于YVO4, BiVO4和TiO2异质结的形成以及光生载流子的双S型电荷传输模式.

关键词: S型异质结, 复合纤维, 静电纺丝, 光催化二氧化碳还原

Abstract:

The double S-scheme heterojunction of YVO4/TiO2/BiVO4 compoite fibers material was prepared by one-step hydrothermal method using TiO2 electrospun nanofibers as substrate. The structures of the composite catalyst were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, ultraviolet visible diffuse reffectance spectroscopy and photoluminescence. The performance of photocatalytic CO2 reduction over the composite catalyst under simulated sunlight was studied. The results show that photocatalytic activity of YVO4/TiO2/BiVO4 composite fibers was investigated via production of methanogenesis from photocatalytic reduction of CO2. The CO2 reduction capability of composite fibers was better compared to that of monomer materials. The photocatalytic production rate of CH4 and CH3OH of YVO4/TiO2/BiVO4 were 13.88 and 3.46 μmol·g‒1·h‒1, respectively. The increased photocatalytic activity of YVO4/TiO2/BiVO4 is attributed to the formation of heterojunctions between YVO4, BiVO4 and TiO2 as well as the S‐scheme charge transfer mode of the photogenerated carriers, both of which are conducive to separation efficiency of photo‐generated carriers and photocatalytic CO2 reduction activity.

Key words: S-scheme heterojunction, Composite fiber, Electrospinning, Photocatalytic CO2 reduction

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